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Passive Acoustic Monitoring the Diel, Lunar, Seasonal and Tidal Patterns RESEARCH ARTICLE Passive Acoustic Monitoring the Diel, Lunar, Seasonal and Tidal Patterns in the Biosonar Activity of the Indo-Pacific Humpback Dolphins (Sousa chinensis) in the Pearl River Estuary, China Zhi-Tao Wang1,2,3, Paul E. Nachtigall3, Tomonari Akamatsu4, Ke-Xiong Wang1*, Yu- Ping Wu5, Jian-Chang Liu6, Guo-Qin Duan7, Han-Jiang Cao7, Ding Wang1* 1 The Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, P. R. China, 2 University of Chinese Academy of Sciences, Beijing, P. R. China, 3 Marine Mammal Research Program, Hawaii Institute of Marine Biology, University of Hawaii, Hawaii, United States of America, 4 National Research Institute of Fisheries Engineering, Fisheries Research Agency, Ibaraki, Japan, 5 School of Marine Sciences, Sun Yat-Sen University, Guangzhou, P. R. China, 6 Transport Planning and Research Institute, Ministry of Transport, OPEN ACCESS Beijing, P. R. China, 7 Hongkong-Zhuhai-Macao Bridge Authority, Guangzhou, P. R. China Citation: Wang Z-T, Nachtigall PE, Akamatsu T, * [email protected] (KXW); [email protected] (DW) Wang K-X, Wu Y-P, Liu J-C, et al. (2015) Passive Acoustic Monitoring the Diel, Lunar, Seasonal and Tidal Patterns in the Biosonar Activity of the Indo- Pacific Humpback Dolphins (Sousa chinensis) in the Abstract Pearl River Estuary, China. PLoS ONE 10(11): e0141807. doi:10.1371/journal.pone.0141807 A growing demand for sustainable energy has led to an increase in construction of offshore Editor: Michael L Fine, Virginia Commonwealth windfarms. Guishan windmill farm will be constructed in the Pearl River Estuary, China, University, UNITED STATES which sustains the world’s largest known population of Indo-Pacific humpback dolphins Received: August 19, 2015 (Sousa chinensis). Dolphin conservation is an urgent issue in this region. By using passive acoustic monitoring, a baseline distribution of data on this species in the Pearl River Estuary Accepted: October 13, 2015 during pre-construction period had been collected. Dolphin biosonar detection and its diel, Published: November 18, 2015 lunar, seasonal and tidal patterns were examined using a Generalized Linear Model. Signifi- Copyright: © 2015 Wang et al. This is an open cant higher echolocation detections at night than during the day, in winter-spring than in access article distributed under the terms of the summer-autumn, at high tide than at flood tide were recognized. Significant higher echolo- Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any cation detections during the new moon were recognized at night time. The diel, lunar and medium, provided the original author and source are seasonal patterns for the echolocation encounter duration also significantly varied. These credited. patterns could be due to the spatial-temporal variability of dolphin prey and illumination con- Data Availability Statement: All relevant data are ditions. The baseline information will be useful for driving further effective action on the con- within the paper. servation of this species and in facilitating later assessments of the effects of the offshore Funding: Grants for this study were provided by the windfarm on the dolphins by comparing the baseline to post construction and post mitigation National Natural Science Foundation (NNSF) of efforts. China (Grant No. 31070347), the Ministry of Science and Technology of China (Grant No. 2011BAG07B05- 3), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KSCX2-EW-Z-4) and the Special Fund for Agro-scientific Research in the Public Interest of the Ministry of Agriculture of China (Grant No. 201203086) to DW, the State PLOS ONE | DOI:10.1371/journal.pone.0141807 November 18, 2015 1/24 Biosonar Activity of Sousa in Pearl River Estuary Oceanic Administration of China (Grant No. Introduction 201105011-3) and NNSF of China (Grant No. 31170501) to KXW and the China Scholarship Marine mammal species occurring in coastal areas are the most likely ones to be at-risk from Council (Grant No. [2014]3026) to ZTW. The funders anthropogenic effects [1]. The Indo-Pacific humpback dolphins (Sousa chinensis, locally called had no roles in designing the study, collecting data, the Chinese white dolphin) was categorized as Near Threatened by the International Union for analyzing data, preparing the manuscript or deciding the Conservation of Nature Red List of Threatened Species [2]. It’s widely distributed through- where to publish the manuscript. out the shallow, coastal waters from the Southern China Sea in the east to the eastern India in Competing Interests: The authors have declared the west and throughout Southeast Asia [2, 3]. This species has a general preference for estua- that no competing interests exist. rine habitats, recognized as transitional zone linking fresh- and marine-water [4], however, the coastal distribution of this species make them susceptible to the impact of human activity [1]. The Pearl River Estuary (Fig 1) is located in subtropical areas of the northern part of the South China Sea, which sustains the world’s largest known population of humpback dolphins [5, 6], with the population size estimated to be over 2500 (CVs: 19–89%) [5]. The area is among the most economically developed regions in China [7] and economic growth has been accelerating human impact on coastal ecosystems [8]. A growing demand for environmentally friendly and sustainable energy has led to an increase in construction of offshore windfarms and the Guishan windmill farm was recently licensed within the Linding waters of the Pearl River Estuary. The location is about 2 km south of the national Chinese white dolphin nature reserve, 15 km southeast of Zhuhai and 10 km east of Macao. This windfarm project consists of a transformer platform and 66 wind turbines with a rated power of 3 MW each arranged in 8 rows and covers an area of about 32.6 km2 with a water depth between 6 and 12 m. Construc- tion and operation of the wind farm potentially affects aquaticlives and might cause marine mammals avoidance of the developing area [9]. The considerable noise emissions associated with pile driving during windfarm construction can cause acoustic disturbance [10] and/or behavioral disruption at ranges of many kilometers [11] and may potentially harm marine mammals in the vicinity by causing temporal or permanent hearing threshold shifts [12]or physical injury [13]. Prolonged disturbance may induce animals to move away, temporarily or permanently, and this may expose the population to unknown, potentially unfavorable, new environmental conditions (e.g. lower food resources, unknown dangers, etc.) to which they are not adapted [13]. In order to protect the humpback dolphins, baseline data during the pre-con- struction period on the dolphin distribution and time-specific habitat preferences in the con- struction area is urgently required. With modelization of the propagation range of generated noise and of levels to be expected in the protected area, these baseline data can help in assessing the effects of offshore wind farms on the animals as well as to designing and enforcing effective mitigation programs. Marine mammals, especially cetaceans, have evolved sophisticated sound production mech- anisms and rely primarily on their acoustic sensing biosonar for communication, navigation and foraging [14, 15]. Beside emitting whistles with a mean fundamental frequencies of 6.4 kHz, and minimum and maximum fundamental frequency averaged at 5.1 kHz and 7.7 kHz, respectively [16], humpback dolphins also produce pulsed sound with a mean peak-peak source level of 199 ± 3 dB re 1μPa at 1m, and mean centroid and peak frequency of 106 ± 11 kHz and 114 ± 12 kHz, respectively [17]. Toothed whales (Odontoceti) generally use biosonar in an intense manner, such as the harbor porpoises (Phocoena phocoena) and Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) that produce sonar click trains every 12.3 and 6.4 s on average) [18], which facilitate the acoustic monitoring of these animals. Pas- sive acoustic monitoring is a well-established and rapidly evolving method to obtain informa- tion on the occurrence, distribution, relative abundance and acoustic behavior of many aquatic mammals over a range of spatial and temporal scales [19, 20]. This method is able to be applied during rough weather conditions and during poor visibility, such as at nighttime periods [21], PLOS ONE | DOI:10.1371/journal.pone.0141807 November 18, 2015 2/24 Biosonar Activity of Sousa in Pearl River Estuary Fig 1. Map of the static acoustic monitoring area. Passive acoustic monitoring device was deployed below a signal tower. The purple dash line shows the area of the planned windmill farm, the blue line area indicates the national Chinese white dolphin nature reserve. The inset map in the lower right corner shows the signal tower. doi:10.1371/journal.pone.0141807.g001 which is logistically impossible for visual observations. Additionally the observed data can be independent of human observer limitations and biases. A previous line transect survey based on visual means, combined with photo-identification studies suggested seasonal variations in distribution of some individual humpback dolphins in the Pearl River Estuary [22, 23], however, detailed information on the temporal trends in the occurrence of dolphin in this region has not been determined. This shortcoming constrains our understanding of whether the expansion of marine renewables poses a significant threat to the local dolphins and should be addressed as a priority. PLOS ONE | DOI:10.1371/journal.pone.0141807 November 18, 2015 3/24 Biosonar Activity of Sousa in Pearl River Estuary By using static acoustic monitoring, the principal objective of this study was to describe the presence of humpback dolphin in the windmill site of the Pear River Estuary during the pre- construction period to fill the knowledge gap. The potential influence of time of the day, lunar, seasonal and tidal phases on their biosonar behavior was further examined.
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